<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // const incrementor = createIncrementor(10)
      // console.log(incrementor()) // 11
      // console.log(incrementor()) // 12
      // console.log(incrementor()) // 13
      const createIncrementor = function (a) {
        let sum = a
        const getSum = function () {
          sum++
          return sum
        }
        return getSum
      }
      const incrementor = createIncrementor(10)
      console.log(incrementor()) // 11
      console.log(incrementor()) // 12
      console.log(incrementor()) // 13
    </script>
  </body>
</html>
